Pest Identification

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Angoumois Grain Moth Exterminator

Angoumois Grain Moth

Angoumois Grain Moth

Adult Angoumois grain moths are small, buff or light brown insects with a wingspan of ½ to 5/8-inch.  The hind wings are gray and taper to a thumb-like projection at their tips.  The forewings and hind wings are fringed with long hairs.  The fully developed larvae are about ¼-inch long and are yellow-white with brown heads.
Females lay an average of 40 eggs during their lifetime, depositing them on or near grain.  The larvae hatch in four to eight days and bore into the kernels where they feed and develop.  They undergo three molts in two to three weeks, and then pupate within the kernel in a silken cocoon.  Adults emerge in about 10 to 14 days.  The lifecycle from egg to egg requires 35 to 49 days.  There are usually four to five generations per year, with as many as 10 to 12 generations per year in heated warehouses.

Angoumois grain moths primarily attack whole grain.  The larvae develop within the undamaged kernels of corn, barley, rye, oats, rice, and other seeds, often infesting the grain before it is harvested.  Adult moths do not cause damage.  Occasionally the larvae develop in caked grain material.  The Angoumois grain moth is also a common household pest which infests decorative Indian corn, popcorn, corn used to fill bean bags, and other whole seeds.  The adults are excellent fliers and are sometimes confused with the clothes moth.  However, adult Angoumois grain moths are attracted to light, and clothes moths are not.